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The Ocean and Atmosphere in the Maritime Continent and Their Impacts
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Indonesian Throughflow in the eastern Indonesian seas during 2014-2017
Tuesday 8th @ 1450-1510, Conference Room 4
Dongliang Yuan* , Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
Xiang Li, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
Zheng Wang, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
Yao Li, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
Jing Wang, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
Adhitya Wardana, Research Center for Oceanography, Indonesian Institute of Sciences, Jakarta, Indonesia
Dewi Surinati, Research Center for Oceanography, Indonesian Institute of Sciences, Jakarta, Indonesia
Adi Purwandana, Research Center for Oceanography, Indonesian Institute of Sciences, Jakarta, Indonesia
Dirhamsyah, Research Center for Oceanography, Indonesian Institute of Sciences, Jakarta, Indonesia
Zainal Arifin, Research Center for Oceanography, Indonesian Institute of Sciences, Jakarta, Indonesia
Presenter Email: dyuan@qdio.ac.cn |
| The mooring observations deployed in the Maluku Channel of the Indonesian Seas during December 2012 through November 2016 show reversals of the thermocline zonal currents from eastward to westward in the springs of 2014 and 2015. The meridional transports in the Maluku Strait are also found to reverse directions from northward to southward at about the same time. The reversals are suggested to be associated with significant shift of the Mindanao Current path, as evidenced by the mooring observations in the Talaud-Morotai Strait. The path shift is suggested to be forced by the westerly winds bursts through the westward propagation of the upwelling equatorial Rossby waves. Associated with the path shift of the Mindanao Current, anomalous transport of the Indonesian Throughflow is generated by the pressure anomalies at the entrance of the Indonesian seas. Upwelling equatorial Kelvin waves are generated to propagate from the western boundary to the east during the relaxation of the westerly winds bursts, which play the role of terminating the onset of the 2014 El Nino. Observations have shown that the reflected upwelling Kelvin waves in the summer of 2015 are much weaker than those in the summer of 2014, which explains the onset of the 2015-2016 strong El Nino. During the summer-fall of 2016, a northward increase of the Maluku Strait transport is observed, which is forced by the downwelling Kelvin waves from the equatorial Indian Ocean during the negative Indian Ocean Dipole in the summer-fall of 2016. The onset of the 2016-2017 La Nina is likely terminated by this Indian-Pacific oceanic channel process. |
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